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How many amps drawn off gas tankless water heater?

The amperage draw of a gas tankless water heater depends on the model and its heating capacity. Typically, gas tankless water heaters range in amperage draw from 12 amps to 30 amps. For example, a 199,000 BTU gas tankless water heater may draw 16.6 amps, while a 389,000 BTU gas tankless water heater may draw 30 amps. It's important to check the manufacturer's specifications for the specific amperage draw of the model you are considering.